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2104100 - Disclosure - Business Combinations
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2404403 - Disclosure - Business Combinations - Assets Acquired and Liabilities Assumed (Details)
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2404402 - Disclosure - Business Combinations (Details)
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2404404 - Disclosure - Business Combinations - Intangible Assets Identified by Segment (Details)
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2121100 - Disclosure - Commitments and Contingencies
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2421402 - Disclosure - Commitments and Contingencies (Details)
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2124100 - Disclosure - Condensed Financial Information of Registrant
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2424403 - Disclosure - Condensed Financial Information of Registrant - Condensed Balance Sheets - Additional Information (Details)
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2424402 - Disclosure - Condensed Financial Information of Registrant - Condensed Balance Sheets (Details)
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2424404 - Disclosure - Condensed Financial Information of Registrant - Condensed Statements of Income (Details)
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2112100 - Disclosure - Debt
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2412403 - Disclosure - Debt - Senior Notes (Details)
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2114100 - Disclosure - Derivatives
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2414402 - Disclosure - Derivatives - Fair Value on Consolidated Balance Sheets (Details)
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2118100 - Disclosure - Employee Benefits
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2105100 - Disclosure - Fair Value Measurements
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2109100 - Disclosure - Goodwill and Intangible Assets
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2409404 - Disclosure - Goodwill and Intangible Assets - Balances of Goodwill (Details)
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2409402 - Disclosure - Goodwill and Intangible Assets (Details)
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2115100 - Disclosure - Income Taxes
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2415402 - Disclosure - Income Taxes (Details)
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2106100 - Disclosure - Investments
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2406404 - Disclosure - Investments - Available-for-Sale (Details)
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2406403 - Disclosure - Investments - Contractual Maturities (Details)
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2406402 - Disclosure - Investments - Schedule of Investments (Details)
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2306301 - Disclosure - Investments (Tables)
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2111100 - Disclosure - Medical Claims and Benefits Payable
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2411403 - Disclosure - Medical Claims and Benefits Payable (Details)
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2103100 - Disclosure - Net Income per Share
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2403402 - Disclosure - Net Income per Share - Computation of Basic and Diluted EPS (Details)
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2108100 - Disclosure - Property, Equipment, and Capitalized Software
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2408403 - Disclosure - Property, Equipment, and Capitalized Software (Details)
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2408404 - Disclosure - Property, Equipment, and Capitalized Software - Future Minimum Rentals (Details)
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2408402 - Disclosure - Property, Equipment, and Capitalized Software - Summary of Property, Equipment, and Capitalized Software (Details)
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2123100 - Disclosure - Quarterly Results of Operations (Unaudited)
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2107100 - Disclosure - Receivables
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2119100 - Disclosure - Related Party Transactions
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2110100 - Disclosure - Restricted Investments
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2122100 - Disclosure - Segment Information
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2102100 - Disclosure - Significant Accounting Policies
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2402408 - Disclosure - Significant Accounting Policies (Details)
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2202201 - Disclosure - Significant Accounting Policies (Policies)
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2402404 - Disclosure - Significant Accounting Policies - Schedule of Premium Revenue (Details)
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2302302 - Disclosure - Significant Accounting Policies (Tables)
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2117100 - Disclosure - Stockholders' Equity
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2417403 - Disclosure - Stockholders' Equity - Components of Share-based Compensation Expenses (Details)
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2417402 - Disclosure - Stockholders' Equity (Details)
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2417406 - Disclosure - Stockholders' Equity - Employee Stock Purchase Plan (Details)
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2417408 - Disclosure - Stockholders' Equity - Stock Incentive Plans (Details)
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2417407 - Disclosure - Stockholders' Equity - Stock Options (Details)
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2120100 - Disclosure - Variable Interest Entities
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